Pass a struct to ContainerNode::childrenChanged() instead of separate arguments

Source/core/html/HTMLFieldSetElement.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2010 Apple Inc. All rights reserved.
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 55 matching lines @@
     }
 }
 
 void HTMLFieldSetElement::disabledAttributeChanged()
 {
     // This element must be updated before the style of nodes in its subtree gets recalculated.
     HTMLFormControlElement::disabledAttributeChanged();
     invalidateDisabledStateUnder(*this);
 }
 
-void HTMLFieldSetElement::childrenChanged(bool changedByParser, Node* beforeChange, Node* afterChange, int childCountDelta)
+void HTMLFieldSetElement::childrenChanged(const ChildrenChange& change)
 {
-    HTMLFormControlElement::childrenChanged(changedByParser, beforeChange, afterChange, childCountDelta);
+    HTMLFormControlElement::childrenChanged(change);
     for (HTMLLegendElement* legend = Traversal<HTMLLegendElement>::firstChild(*this); legend; legend = Traversal<HTMLLegendElement>::nextSibling(*legend))
         invalidateDisabledStateUnder(*legend);
 }
 
 bool HTMLFieldSetElement::supportsFocus() const
 {
     return HTMLElement::supportsFocus();
 }
 
 const AtomicString& HTMLFieldSetElement::formControlType() const
@@ skipping 40 matching lines @@
     }
 }
 
 const FormAssociatedElement::List& HTMLFieldSetElement::associatedElements() const
 {
     refreshElementsIfNeeded();
     return m_associatedElements;
 }
 
 } // namespace